I think I need a specific codec to view something, but I don't know what. I have the most recent Nimo pack but it doesn't seem to show the video either. I also have the most recent DivX codec. It's only sound.

Any suggestions? Well, if it will help, the video files I have trouble viewing are:

Gravitation - 9, 10, 11
NieA Under 7 - 12,13